for Cisco IP Phones Headset, PChero 6ft Binaural Hands-Free Call Center Noise Cancelling Corded 4-Pin RJ9 Crystal Head Headset Headphone with Mic for Cisco IP Desk Phones The microphone noise abatement can reach the aviation noise reduction level. Helical headphone cable which will avoid damaging during the use. Comfortable to wear: made of the flexible metal hose with the positioning accuracy MIC + Structural Design + Durable. The Best Call Quality: Around 10,000 times Testing, the microphone boom rotates, 330 degree adjustable boom. Hearing protection technology, care of the user's hearing.